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| n | a(n) |
|---|---|
| 1 | 2 |
| 2 | 8 |
| 3 | 29 |
| 4 | 128 |
| 5 | 646 |
| 6 | 3659 |
| 7 | 22934 |
| 8 | 156964 |
| 9 | 1161703 |
| 10 | 9226528 |
| 11 | 78148154 |
| 12 | 702245554 |
| 13 | 6665759481 |
| 14 | 66584311674 |
| 15 | 697658373059 |
[2,8,29,128,646,3659,22934,156964,1161703,9226528, 78148154,702245554,6665759481,66584311674, 697658373059] |